Somatosensory inputs modify auditory spike timing in dorsal cochlear nucleus principal cells.

Somatosensory inputs modify auditory spike timing in dorsal cochlear nucleus principal cells.
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DOI:
10.1111/j.1460-9568.2010.07547.x
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发表时间:
2011-02
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Shore SE
Shore SE
中科院分区:
其他
文献类型:
--
作者:
Koehler SD;Pradhan S;Manis PB;Shore SE

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除了听觉输入,豚鼠耳蜗背核(DCN)锥体细胞接受和响应体感输入,并执行多感觉整合。DCN锥体细胞对声音的反应具有特征性的尖峰定时模式,该模式部分由快速失活钾电导控制。停用这些电导可以修改对声音的响应的尖峰速率和尖峰定时。已知体感通路会改变对后续声刺激的反应率,但其对尖峰时间的影响尚不清楚。在这里,我们证明了先前的音调刺激和三叉神经脊束核(Sp5)刺激显着改变了第一个锋电位潜伏期、第一个锋电位间隔以及音调诱发的放电的平均放电规律。无论神经元是否被单独的Sp5刺激所兴奋或抑制,这些效应都会发生。我们的研究结果表明,DCN的多感觉整合改变了锥体细胞中声刺激的尖峰时间表示。这些变化可能是通过内在兴奋性的突触调节或突触抑制而发生的。
In addition to auditory inputs, dorsal cochlear nucleus (DCN) pyramidal cells in the guinea pig receive and respond to somatosensory inputs and perform multisensory integration. DCN pyramidal cells respond to sounds with characteristic spike-timing patterns that are partially controlled by rapidly inactivating potassium conductances. Deactivating these conductances can modify both spike rate and spike timing of responses to sound. Somatosensory pathways are known to modify response rates to subsequent acoustic stimuli, but their effect on spike timing is unknown. Here, we demonstrate that preceding tonal stimulation with spinal trigeminal nucleus (Sp5) stimulation significantly alters the first spike latency, the first interspike interval, and the average discharge regularity of firing evoked by the tone. These effects occur whether the neuron is excited or inhibited by Sp5 stimulation alone. Our results demonstrate that multisensory integration in DCN alters spike-timing representations of acoustic stimuli in pyramidal cells. These changes likely occur through synaptic modulation of intrinsic excitability or synaptic inhibition.
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